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The Osprey class were of composite construction, with wooden hulls over an iron frame. They were designed by the Chief Constructor, William Henry White and five were ordered. Of 1,130 tons displacement and approximately 950 indicated horsepower, they were capable of approximately 11 knots and were armed with two 7" muzzle-loading rifled guns on pivoting mounts, and four 64-pound guns (two on pivoting mounts, and two broadside). They had a crew complement of approximately 140 men.